selected function not returning values

[wuerdo]

• C3 version:0.6.0
• D3 version:5.6.0
• Browser: Firefox
• OS: Ubuntu 16.04

I upgraded to a newer C3/D3 combo and I keep running into this problem. I've been using the selected() function before and it worked fine. When I do that after the update I get a 'map is not a function' error. Here's a fiddle: https://jsfiddle.net/z8bxskqy/5/
Here when you select something in the chart and press the button you're supposed to get the selected values but instead it throws an error.

[wuerdo]

Seems to be related to/same as: #2477

[panthony]

Closing as #2477 was fixed. If issue is still occurring on latest version please reopen